The Factory Design pattern is used when we have a superclass ... and ensures that only one instance of the class exists in the Java Virtual Machine (JVM). The implementation of the Singleton ...

The Java code below shows the details of how to use a variant of Abstract Factory design pattern to do the dependency injection. //Abstract Factory for Dependency Injection //Factory interface public ...

David Geary’s series is a masterful introduction to many of the Gang of Four patterns in Java code. Design Patterns is canonical reading for software developers, but many new programmers are ...

Get an overview of design patterns, then use what you've learned to evaluate whether the Composite pattern is a good choice for a particular Java use case Numerous strategies have been devised to ...